Samantha builds a lever to lift objects in a science experiment. The load arm is 0.4 meters. If

Question

she wants the lever to have a mechanical advantage of 7, how long should the effort arm be?
2.8 m
17.5 m
7.4 m
3.2 m

Answer 1

The formula for mechanical advantage in a lever is Effort Arm Length / Load Arm Length.

Given that the load arm length is 0.4 meters and the mechanical advantage is 7, we can set up the equation as:

7 = Effort Arm Length / 0.4

Solving for Effort Arm Length:

Effort Arm Length = 7 * 0.4
Effort Arm Length = 2.8 meters

Therefore, the effort arm should be 2.8 meters long.

So the correct answer is: 2.8 m